Apparatus for improving combustion in furnaces



(No Model.)

V TKM PEYNON. APPARATUS FOR IMPROVING GOMBUSTIONIN FURAIAGES. No.569,329. Patented Oct. 13, 1896.

UNITED STATES PATENT OFFICE.

THOMAS M. EYNON, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR IMPROVING COMBUSTION IN FURNACES.

SPECIFICATION forming part of Letters Patent No. 569,329, dated October13, 1896.

Application filed December 27, 1895. Serial No. 573,538. (No model.)

To all whont it may concern.-

Be it known that I, THOMAS M. EYNON, a citizen of the United States,residing in the city and county of Philadelphia,State of Pennsylvania,have invented a new and useful Improvement in Apparatus for ImprovingCombustion in Boiler and other Furnaces, which improvement is fully setforth in the following specification and accompanying drawing.

My invention consists of a novel apparatus for improving combustion ofboiler and other furnaces, by means of which the heat radiated from achimney or stack, which is ordinarily wholly lost, is utilized to highlyheat the air in contact therewith, said air being confined in a casinginclosing said stack and being afterward conducted therefrom to asuitable portion of the furnace, above or below the grate, either bymeans of a natural or forced draft, which latter may be induced eitherby a fan or steam-jet blower, or both.

It further consists of novel details of construction, all as will behereinafterset forth.

The figure represents a vertical transverse sectional view of anapparatus for improving combustion in boiler and other furnacesembodying my invention.

Referring to the drawing, A designates the walls of a furnace, and B aboiler suitably supported therein, the boiler shown in the presentinstance being of the horizontal tubular type, although it is obviousthat any desired construction of boiler may be employed or that a boilermay be dispensed with.

O designates the grate-bars, D the ash-pit, and E the steam-dome.

F designates the stack or chimney, which communicates with the outletfor the hot gases and products of combustion in any suitable manner andmay be secured to the plate G, which rests on the furnace-walls A.

II designates an outer casing or shell which incloses the chimney F,said casing resting also on the plate G.

J designates a hood attached to the stack F so as to overhang the casingH, and thus prevent water, &c., from entering the space between thelatter and said stack.

K designates a pipe having one end attached to the lower portion of thecasing H, while the other end is connected to a steam-jet blower L, thelatter having connected to its upper portion the valved steam-pipe M,which conducts the steam from the steam-dome E to said blower.

N designates a pipe leading from the discharge end of the blower to theash-pit D, and it is obvious that, if desired, a branch pipe P,discharging above the grate and having the blast-gate B therein,may beemployed.

Q designates a valve for the steam-jet blower, and R designates ablast-gate in the pipe K.

S designates a pipe leading from the casing H and having discharge-pipesT and U, which communicate with the furnace above and below the grate. Zand A designate blast-gates in said pipes S and T,' respectively.

V designates a fan-blower, which has a dischargepipe W leading therefrominto the upper portion of the casing H.

X designates a suitable partition which is to be interposed between thestack and easing at a point intermediate the top of the latter and thejunction of the pipe IV therewith, said partition being dispensed withwhen the steam-jet blower alone is used.

0 designates a spiral plate of suitable construction which is to beinterposed between the casing and stack, the function of said spiralplate being to retard the downward passage of thehot air from the upperportion of said casing to the pipes S and K.

The operation is as follows: The hot gases and products of combustionpassing out of the chimney F highly heat the air contained between thelatter and the casing H, and when the proper blast-gates are opened thehot air will be conducted by natural draft through the pipes K and Sinto the furnace, above or below the grate, or both, as may be desired,and a perfect combustion will be insured. By starting the fan-blower Vor the steam-jet blower L the hot air will be supplied through the pipesS and K to the furnace, above or below the grate, or both, as isevident. It will thus be seen that by the above apparatus thehighly-heated air can be introduced into one or both sides of thefurnace, above or below the grate, or both, either by natural or forceddraft, singly or both together, and it will, furthermore, be apparentthat the principle of my invention is applicable to any construction offurnace which has a stack or chimney whereby the hot gases or productsof combustion are conducted therefrom the heat ordinarily lost or wastedbeing utilized in the manner above described and a practically perfectcombustion being attained, as is evident.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. A furnace having a grate,a flue provided with a surrounding jacketforming an intervening air-space, a spiral plate located in saidair-space, pipes leading from said jacket and having branches leadinginto said furnace above and below said grate, gates in said pipes, aboiler in said furnace having a steampipe leading therefrom, and asteam-jet connected with said steam-pipe, and discharging into one ofsaid former-mentioned pipes, said parts being combined substantially asdescribed.

2. A furnace having a grate, a flue provided with a surrounding jacketforming an intervenin g air-space, a hood on said flue covering the topof said air-space, a spiral plate located in said air-space, pipesleading from said jacket and having branches leading into said furnaceabove and below said grate, gates in said pipes, a boiler in saidfurnace having a steam-pipe leading therefrom, and a steamjet connectedwith said steam-pipe and discharging into one of said former-mentionedpipes, said parts being combined substantially as described.

3. Afurnace having a grate, a flue provided with a surrounding jacketforming an intervenin g air-space, a spiral plate located in saidair-space, pipes leading from said jacket and having branches leadinginto said furnace above and below said grate, gates in said pipes, anairblast pipe leading into said jacket, a boiler in said furnace havinga steam-pipe leading therefrom, and a steamjet connected with saidsteam-pipe, and discharging into one of'said former-mentioned pipes,said parts being combined substantially as described.

4:. Afurnace havinga grate, a flue provided with a surrounding jacketforming an intervening air-space, a hood on said flue covering the topof said air-space,'a spiral plate located in' said airspace, pipesleading from said jacket and having branches leading into said furnaceabove and below said grate, gates in said pipes, an air-blast pipeleading into said jacket, a boiler in said furnace having a steam-pipeleading therefrom, and a steamjet connected with said steam-pipe, anddischarging into one of said former-mentioned pipes, said parts beingcombined substantially as described.

THOMAS M. EYNON. 'Witnesses:

JOHN A. WIEDERSHEIM, E. H. FAIRBANKS.

